Thermal behavior of alginic acid and its sodium salt
Vol. 29 No. 2 (2004), Original articles
Vol. 29 No. 2 (2004)

Thermal behavior of alginic acid and its sodium salt

Original articles
https://doi.org/10.26850/1678-4618eqj.v29.2.2004.p57-63
Published 2004-12-07
João da Paixão Soares
Universidade Federal de São Carlos, Departamento de Química, São Carlos, Brasil.
Jose Estrela dos Santos
Universidade Federal de São Carlos, Departamento de Química, São Carlos, Brasil. Universidade Federal de Campina Grande, Departamento de Ciências Exatas e Natureza, Cajazeiras, Brasil.
Gilberto Orivaldo Chierice
Universidade de São Paulo, Instituto de Química, São Carlos, Brasil.
Éder Tadeu Gomes Cavalheiro
Universidade de São Paulo, Instituto de Química, São Carlos, Brasil.
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Keywords

alginic acid
thermogravimetry
differential scanning calorimetry

How to Cite

Soares, J. da P., dos Santos, J. E., Chierice, G. O., & Cavalheiro, Éder T. G. (2004). Thermal behavior of alginic acid and its sodium salt. Eclética Química, 29(2), 57–63. https://doi.org/10.26850/1678-4618eqj.v29.2.2004.p57-63
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Abstract

An evaluation of hydration and thermal decomposition of HAlg and its sodium salt is
described using thermogravimetry (TG) and differential scanning calorimetry (DSC). TG curves in
N 2 and air, were obtained for alginic acid showed two decomposition steps attributed to loss of water
and polymer decomposition respectively. The sodium alginate decomposed in three steps. The first
attributed to water loss, followed by the formation of a carbonaceous residue and finally the Na 2 CO 3 .
DSC curves presented peaks in agreement with the TG data. In the IR alginic acid presented bands at
1730 and 1631 cm -1 , while sodium alginate presented a doublet at 1614 e 1431 cm -1 , evidencing the
presence of salified carboxyl groups.
https://doi.org/10.26850/1678-4618eqj.v29.2.2004.p57-63
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